snappier command palette

src/textual/app.py

@@ -926,6 +926,23 @@ class App(Generic[ReturnType], DOMNode):
         if not self._batch_count:
             self.check_idle()
 
+    def _delay_update(self, delay: float = 0.05) -> None:
+        """Delay updates for a short period of time.
+
+        May be used to mask a brief transition.
+
+        Args:
+            delay: Delay before updating.
+        """
+        self._begin_batch()
+
+        def end_batch() -> None:
+            """Re-enable updates, and refresh screen."""
+            self.screen.refresh()
+            self._end_batch()
+
+        self.set_timer(delay, end_batch, name="_delay_update")
+
     @contextmanager
     def _context(self) -> Generator[None, None, None]:
         """Context manager to set ContextVars."""
@@ -3504,7 +3521,8 @@ class App(Generic[ReturnType], DOMNode):
         try:
             if renderable is None:
                 return
-
+            if self._batch_count:
+                return
             if (
                 self._running
                 and not self._closed

src/textual/command.py

@@ -1231,6 +1231,7 @@ class CommandPalette(SystemModalScreen[None]):
                 # decide what to do with it (hopefully it'll run it).
                 self._cancel_gather_commands()
                 self.app.post_message(CommandPalette.Closed(option_selected=True))
+                self.app._delay_update()
                 self.dismiss()
                 self.app.call_later(self._selected_command.command)
 

src/textual/screen.py

@@ -1310,7 +1310,6 @@ class Screen(Generic[ScreenResultType], Widget):
         """Called by App when the screen is resized."""
         if self.stack_updates:
             self._refresh_layout(size)
-            self._compositor_refresh()
 
     def _on_screen_resume(self) -> None:
         """Screen has resumed."""
@@ -1331,6 +1330,7 @@ class Screen(Generic[ScreenResultType], Widget):
                         self.set_focus(widget)
                         break
 
+        self._compositor_refresh()
         self.app.stylesheet.update(self)
         self._refresh_layout(size)
 

tests/test_command.py

@@ -59,5 +59,4 @@ async def test_command_dismiss():
         await pilot.press("ctrl+p", *"modal quit", "enter")
         await pilot.pause()
         await pilot.press("enter")
-        await pilot.pause()
         assert app.check_quit_called